? joining us from los angeles, rocco bellic, director of happy, and he's from los angeles, and author doing extensive research on materialism and happiness, and finally, from copenhagen, alexander carol, one of the leading experts on happiness in the workplace, and he's the author of the book, happy hour is 9-5. alexander, you are up first as our happiness expert. divine for us and measure happiness in the 21st century. easy question. >> s this a question that philosophers have struggled with for thousands of years. the term, happiness, in my phone number, life satisfaction, where you stop people and them on a scale of 1-10, all things considered, how happy are you with your life? and they will give you a rating. and the other thing, how you feel on a day-to-day basis. you can ask them about their day yesterday, and you ask them how you feel. and there's a happiness curve for that day. so my satisfaction is measured, and that's why it's used in a lot of surveys. it's a very valuable tool. but it's more about how you think about your life. rational decision, are you satisfied with your life?